SKRBL - Online Whiteboard

Here is a great little tool for getting some collaborative brainstorming happening or posting information online, realtime using the SKRBL online white board.
The complete web whiteboard.
Just start skrbl, give out your URL and instantly share online.
Use skrbl to collaborate with others or, keep it your own private web space.
Write notes, sketch drawings, upload pictures, share files...
Everyone sees the same screen,
Everybody stays on the same page.

Check out at http://www.skrbl.com/